SKIP DICKSTEIN2of6Assistant District Attorney Andrew Botts speaks during the sentencing for Johnny Oquendo of Troy at the Rensselaer County Courthouse on Thursday, March 8, 2018 in Troy, N.Y. Oquendo is convicted of killing his stepdaughter and dumping her body in the Hudson River. The judge granted a postponement until Monday so Oquendo could read over the pre-sentencing report. Oquendo is representing himself. (Lori Van Buren/Times Union)Lori Van Buren3of6State Supreme Court Justice Andrew Ceresia announces recess in a case involving Cresencio Salazar at the Rensselaer County Court House on Thursday, Aug. 2, 2018 in Troy, N.Y. Salazar was not indicted by DA Joel Abelove within 45 days as set by state law in the case of two Mexican nationals allegedly killed by Salazar and three other men, all of whom are Mexican nationals.(Lori Van Buren/Times Union)Lori Van Buren4of6Interpreter Jorge Baldizon, left, translates for Cresencio Salazar, center, as his attorney Trevor Hannigan, right, listens to Cheryl McDermott, assistant district attorney, speak to State Supreme Court Justice Andrew Ceresia at the Rensselaer County Court House on Thursday, Aug. 2, 2018 in Troy, N.Y. Salazar was not indicted by DA Joel Abelove within 45 days as set by state law in the case of two Mexican nationals allegedly killed by Salazar and three other men, all of whom are Mexican nationals.(Lori Van Buren/Times Union)Lori Van Buren5of6Magdaleno Perez-Calixto, 28, of Latham, center, makes an appearance in Rensselaer County Court for his arraignment on numerous charges, including murder on Monday, Nov. 21, 2016, in Troy, N.Y. (Skip Dickstein/Times Union archive)SKIP DICKSTEIN6of6Salomon Najera Hernandez

TROY – It was a double-homicide investigation that detectives were sure would end with four men convicted for their alleged roles in the 2016 slaying of two roommates.

But two year's later, just one man will stand trial for homicide and only for one of the killings.

Murder cases against the others were dropped after prosecutors in the office of former Rensselaer County District Attorney Joel E. Abelove failed to show grand jurors corroborating evidence that would have allowed the charges to withstand legal challenges from the suspects' attorneys.

Abelove's office failed to give three different grand juries evidence corroborating to support the statements the men allegedly made to investigators after the killings of Jaiver Gomez Bartolon and Cristian Gonzalez Hernandez.

On Monday, Luis Alfredo Monge Guevara goes on in state Supreme Court Justice Andrew Ceresia’s courtroom as prosecutors from the office of Abelove's successor, Mary Pat Donnelly, try to convince a jury that Guevara took part in the Oct. 17, 2016 killing of Bartolon. He died in an apartment he shared with Cristian Gonzalez Hernandez at 1 East Glen Ave. in Troy.

No one faces murder charges anymore for the killing of Hernandez. He was killed the day before Guevara and his body was dumped in the Quacken Kill in the Brunswick hamlet of Cropseyville. That case ended with guilty pleas to lesser charges after the failed indictments.

Guevara will be on trial for two counts of second-degree murder and one count each of first-degree burglary, second-degree burglary and fourth-degree conspiracy in Bartolon's killing. Assistant District Attorney Andrew Botts is prosecuting the case while Jay Hernandez III is the defense attorney for Guevara.

But murder indictments filed against Calixto, Salazar, and Hernandez were thrown out by the judge because prosecutors failed to show the grand jury evidence that backed up statements the men allegedly made.

Law enforcement sources with knowledge of the investigation said the four suspects were partying with Gonzalez at a Colonie motel. The situation turned violent and they allegedly beat Gonzalez during a robbery.

Police said the four men then went to Gonzalez' second-floor apartment in Troy to steal money. They were accused of beating and stabbing Bartolon.

After Hernandez died in Brunswick and Bartolon in Troy, Guevara, Hernandez and Calixto allegedly fled to Virginia, dropping off Salazar in New York City as they headed south. The trio was arrested and questioned in Virginia before being sent back to Troy. Salazar was arrested in New York City.

Guevara, Hernandez and Calixto all spoke to police, allegedly implicating Salazar. But as accomplices, their testimony had to be supported by other evidence. It wasn't. Salazar refused to speak to police, who identified him as the ringleader of the four in the killings and the burglary in Troy.